Process for preparing highly reactive (semi) crystalline and...

Details Process for preparing highly reactive (semi) crystalline and... Process for preparing highly reactive (semi) crystalline and...

C - Chemistry, Metallurgy

08

G

C08G 18/09 (2006.01) C07D 403/14 (2006.01) C08G 18/08 (2006.01) C08G 18/80 (2006.01) C09D 5/44 (2006.01) C09D 5/46 (2006.01) C09D 175/12 (2006.01)

Patent

CA 2352675

Disclosed is a solventless continuous process for preparing a mixture of (semi)crystalline and amphorous blocked polyisocyanates, by: [I] reacting a mixture of (A) an aliphatic, (cyclo)aliphatic or cycloaliphatic diisocyanate compound and (B) an aliphatic, (cyclo)aliphatic or cycloaliphatic polyisocyanate compound containing an isocyanurate group with a blocking agent that is (C) 1,2,4-triazine or (D) a pyrazole compound, in an extruder, intensive compounder, intensive mixer or static mixer by intensive commixing and short term reaction with a supply of heat, and [II] isolating the resulting end product by rapid cooling.

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